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Signal flow on the ITL boards of OSN 8800 devices

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The ITL board is used to multiplex and demultiplex odd and even wavelengths. The wavelengths from the RO and RE ports are multiplexed into one wavelength and then sent out through the OUT port. The wavelength from the IN port is demultiplexed as two wavelengths and sent out through the TO and TE ports separately.

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An ITL board is used to multiplex and demultiplex the odd and even wavelengths. The wavelengths from the RO and RE ports are multiplexed into one wavelength and then sent out from the OUT port. The wavelength from the IN port is demultiplexed to two wavelengths and sent out from the TO and TE ports.

One multiplexed optical signal received through the IN port is sent to the EDFA optical module. The EDFA optical module amplifies the optical power of the signal and locks the gain of the signal. The signal is added to the DCM board through the TDC port for color dispersion compensation. Then the signal is sent to the RDC port. At last, the amplified multiplexed signal is output through the OUT port.
A multiplexed signal can be also input through the VI port, processed for optical power adjustment, and output through the VO port. Then the IN port receives the multiplexed signal sent through the VO port.

After optical signals enter the IN port of the RDU9 board, they are split based on power by an optical splitter. Then, one multiplexed signal is output by the EXPO port of the board and the other one is output by the TOA port.
The TOA port can be connected to an OA unit. If cascading is not required, the optical signal can be directly input to the ROA port of the RDU board.
After the optical signal enters the ROA port, it is evenly split by an optical splitter. The split signals are then output by ports DM1 to DM8 of the RDU board.